正常的Q波振幅应小于同导联中R波的多少（）
A.1/2
B.1/3
C.1/4
D.1/5
E.1/6
参考答案：C
线路发生两相短路时，短路点处正序电压和负序电压的关系为（）
Will you be free tomorrow morning?（）
A.No, I'll be busy
B.What is the matter?
C.I'm sorry I won't be free then
D.No, I'll have no time
